I personally see a lot of benefits from this feud going forward, in that both men could be significantly helped out. Ziggler is a guy that the WWE clearly has bigger plans for, considering he is a former World champion (no matter how short that reign was). Riley is a young, new face that also seems to be in line for some type of push in the future.
Ziggler has finally gained a foothold on Raw, after being somewhat lost after first joining the brand. That being said, Ziggler simply is above the United States title at this point in his career. I mentioned his earlier World Title victory. It makes little sense to have him defending and fighting over a midcard title. It served its purpose in giving him something to do, another notch on his belt, and needed credibility on the show. The time is right to see if he really has what it takes to be a main eventer, or at least a potential one. I believe he could drop the title to Riley, and along with it Vicky, and be given the opportunity to stand on his own to feet. The main question is whether or not he makes it, but the time is right for him to be given the chance. My viewpoint is that saddling him with Vicky is only going to pigeon hole him as a guy who can't win without her. It's time to see if the effort putting into establishing him will work.
As for Riley, his feud with Miz put him on the map. Since that feud is now seemingly over, he has stalled a bit. The easiest remedy would be to give him his first taste of championship gold. Honestly, the United States title is far from the holy grail of wrestling. It's lost much of its prestige, namely due to bad and questionable booking. The gamble of putting it on Riley is not that costly. A Riley title win gives him the opportunity to see if he can build off of and recapture the momentum he had from his feud with Miz. Perhaps he gains more credibility and can be groomed for a move up the cards. Maybe it doesn't work either. It wouldn't be hard to take the title off him in a month or two if that's the case. If nothing else, he at least has the reign on his resume for future consideration. I feel the gambit would be worth the effort. You can find out if you have a potential future star or a guy who doesn't have what it takes. To me, that's a chance you take to find out what you have in Riley.